Men with a white film covering the coronary groove with a fishy odor can be cleaned with potassium permanganate. If this does not work, medication may also be used. The presence of a white film over the glans with a fishy odor is usually considered a fungal glans infection. Fungal glans can lead to abnormal discharge, itching, or a fishy odor on the surface of the glans, so it can be cleaned externally with potassium permanganate lotion, which is effective in sterilizing and relieving itching. Potassium permanganate lotion usually needs to be configured at a ratio of 1:5000 to avoid too high or too low a concentration. Potassium permanganate lotion for the treatment of fungal glans can play an effective anti-bacterial and anti-itching effect. However, if a man’s fungal infection is too severe or the damage is too obvious, potassium permanganate lotion may not be able to provide a cure, so you may also want to consider taking or applying a topical antibacterial medication for rapid treatment. Bacteriostatic drugs include quinolone, penicillin and so on. Men with abnormalities of the glans or external genitalia should confirm the diagnosis and choose the appropriate medication and method of treatment under the guidance of a doctor.